A normal village with aprox 10 villagers. 4 or 5 farms.
Two nights in a row I have seen villagers leave their houses to go and check/harvest stuff from the farms. It possible that wheat and potatos grow to final stage since I'v added some torches here and there.
I'v also notice that a zombie can hir through the doors if I or a villager is standing very close to the door.
I'v also seen a baby zombie spawn inside a rather dark house. (this could have been a normal villager killed through the door).
I can see one villager standing inside a small house without closing the door.
I'v seen one villager getting killed during night running around like a headless chicken with several nice houses around him.
This issue is a duplicate of MC-12675. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.